Yieldable gear-wheel.



PATENTED APR. 18,1905. E C. G. MATTISON.

YIELDABLE GEAFu WHEEL.

APPLIUATION :FILED Nov. 2a, 1904.

' 2 SHEETS-SHEET 1.

No. 787,524. I PATENTED APB.. 18, 1905.

G. C. MATTISON.

`YIELDABLE GEAR'WHEEL.

APPLIGATIQN FILED Nov. z3, 1904.

2 SHEETS-SHEET 2.

wbr/naamw VIl iatenteti April 18, 19015.

PATENTA OFFICE.

CYRUS C. MATTISON, OF CHICAGO, ILLINOIS.

i YIELDABLE GEAR-WHEEL.

SPECIFICATION'fOrming part of Letters Patent No. 787,524, dated April 18, 1905. a i i. Application filed November 23, 1904. Serial No. 233,992...

To all whom t may concern,.-

Be it known that I, CYEUs C. MA'r'rrsoN, a citizen of the United States, residing at Chicago, in the county of Cook and State of lllinois, have invented new and useful Improvements in Yieldable Gear-Wheels, of which the following is a specification.

This invention is a yieldable gear-wheel designed particularly to relieve the Wheel and the driving connections from a sudden strain or shock, as when taking on a heavy load or starting the machinery.

The object of the invention is to produce an improved device of the kind having particular advantages of strength and solidity of construction. The wheel is so constructed that the strain is absorbed in either direction.

The invention is illustrated in connection with a sprocket-wheel; but it is applicable to all` kinds of pulleys and gear-wheels. y

1n the accompanying drawings, Figure 1 is a side view of the wheel. Fig. 2 is a central cross-section thereof. Fig. 3 is a plan or side view with one of the side plates removed. Fig. 4. is a detail in plan of one, of the blocks against. which the springs abut.

Referring specifically to the drawings, 6indicates the hub of the wheel, having integral therewith one side section or disk 7. 8 indicates the opposite sidesection or disk, held in place by bolts 9, extending through the hub. rl`he disk 8 fits in a rabbet 10, produced in the hub of the wheel, and each disk has at its periphery on the inner side a rabbet 11, which receives the shoulder 12 of the rim 13, which in the construction shown has sprocket-teeth 14. The body of the rim lits betweenl the side plates 7 and 8 and has a limited circular movement therebetween, as more fully described hereinafter. The side plates 7 and 8 are further held together by countersunk screws 15, which extend through the disk 8 into blocks 16, which are formed integrally on the inner face of the plate 7 and extend across the space between the plates to contact with the plate 8. These blocks have the further function that they act as supporting-guides for the rim and also as stops to limit the slip or yielding movement thereof. The annular rim lits at the inside against the finished outer surface 17 of the blocks, and the sidesY 18 of the blocks are in position to receive the contact of lugs 19, projecting inwardly from the rim to stop the yielding movement of the rim. It will be seen that the blocks 16 are disposed on opposite sides of the lugs 19, acting as stops in both directions.

rlhe springs which provide the yielding movement referred to are indicated at 20. These are coiled around bolts 21, which are pivotally connected to the lugs 19 and are locatcd in the space between the plates 7 and 8.

The springs abut at one end against a washer and nuts 22 on the end of the bolt and at the other end against a block 23 through an opening 24, in which the bolt 21 extends. These blocks have trunnions 25, which fit in holes in the opposite side plates, so that the blocks are free to turn to accommodate the lateral motion incident to the yielding movement. The blocks stand the strain on the wheel and are consequently stoutly constructed.

The lugs 19 on the rim are diametrically opposite,and there is a pair of springs and connecting-bolts for each lug, so that yielding movement in both directions is permitted.

In operation power applied to the rim of the wheel will be transmitted to the hub, or vice versa, and because of the spring connection therebetween any sudden shock or strain will be absorbed, thereby avoiding stripping or wrecking the wheel and the dangers incident thereto. Undue strain may compress the springs to such an extent that the lugs 19 will strike and stop against the blocks 16, producing in such case a substantially solid gearwheel.

What I claim as new, and desire to secure by Letters Patent, is-

1. A yieldable wheel comprising a hub, spaced disks projecting therefrom and having blocks therebetween,and a yieldable rim which fits between the outer edges of the disks and rests upon said blocks.

2. A yieldable wheel comprising a hub, spaced disks projecting therefrom, a rim movable upon the outer edges of the disks and having lugs projecting between said disks, springs connected to said lugs, and abutment-blocks for the springs, extending between said disks.

IOO

3. A yieldable wheel comprising a hub, spaced disks thereon, a rim movably supported at the outer edges of the disks and having lugs projecting therebetween, blocks extendl ing across between the disks, rods connected to the lugs and extending through the blocks, and springs coiled around the rods and abutting against the blocks.

4. A yieldable wheel comprising a hub, spaced disks projecting therefrom, a pair of blocks between the disks, and a vieldable rim l movably supported on the outer edge of the l disks and having a lug which extends between l the blocks and is constructed to stopagainst the same at the limit of yielding movement.

In testimony whereof I have signed my name to this speciiication in the presence of two subscribing witnesses.

CYRUS C. MATTISON. Witnesses:

WM. J. ROBINSON, SIGNA' FELTsKoG. 

